8
Kamin To the degree that the case for a genetic influence on IQ scores rests on the celebrated studies of separated twins, we can justifiably conclude that there is no reason to reject the hypothesis that IQ is simply not heritable. (e.g., Kamin, 1974, p. 67; cf. also Kamin in Eysenck & Kamin, 1981, p. 154; Lewontin, Rose & Kamin, 1984, pp )

9
Farber My own evaluation, particularly of the allegedly scientific analyses of the IQ data, is more caustic. Suffice it to say that it seems that there has been a great deal of action with numbers but not much progress-- or sometimes not even much common sense. (Farber, 1981, p. 22).

10
Taylor In sum, given the available methods and data, there once again appears to be no compelling reason to postulate the existence of any genes “for” intelligence. (Taylor, 1980, p. 111).

14
Taylor The similarity in educational, socioeconomic, and interpersonal environments, referred to here as social environment, is a central reason why monozygotic twins regarded in the professional literature as separately raised reveal similar IQ scores. MZ twin pairs who have had similar social environment (such as similar schooling) have similar IQs, and twin pairs who have relatively different social environments (especially different schooling) have different IQs. (p. 92).

15
Effect of Similar Environments on MZA Correlations

16
Effect of Being Raised by Relatives on MZA Correlations

17
Effect of Being Reunited on MZA Correlations

18
If partial reunions can cause MZA’s to correlate.84, then why do: Non-twin siblings raised together only correlate.46? DZ twins raised together correlate.58? Unrelated adoptees raised together correlate.31? Virtual twins raised together correlate.26? Effect of Being Reunited on MZA Correlations

28
Molecular Genetic Studies of IQ Intelligence influenced by many genes, each exerting only a small influence QTL designs need to be very powerful to detect small genetic effects To-date, only a few QTL studies of IQ and limited (if any) replication Plomin’s IQ QTL Project